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openwrt-xburst/package/iptables/files/l7/ntp.pat
pavlov 3b8c7ad8bb update stripped subset of l7 patterns to 11-03-2007 patterns
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@9582 3c298f89-4303-0410-b956-a3cf2f4a3e73
2007-11-19 23:07:00 +00:00

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# (S)NTP - (Simple) Network Time Protocol - RFCs 1305 and 2030
# Pattern attributes: good fast fast overmatch
# Protocol groups: time_synchronization ietf_draft_standard
# Wiki: http://www.protocolinfo.org/wiki/NTP
#
# This pattern is tested and is believed to work.
# client|server
# Requires the server's timestamp to be in the present or future (of 2005).
# Tested with ntpdate on Linux.
# Assumes version 2, 3 or 4.
# Note that ntp packets are always 48 bytes, so you should match on that too.
ntp
^([\x13\x1b\x23\xd3\xdb\xe3]|[\x14\x1c$].......?.?.?.?.?.?.?.?.?[\xc6-\xff])